Why it is not worth using UUID v4 as primary keys in Postgres

The article by Andy Atkinson addresses the significant issue of using UUID version 4 as primary keys in databases. Atkinson points out that while UUIDs are popular in many projects, they come with drawbacks that can negatively impact application performance. For one, UUID v4 keys are random, which can lead to data fragmentation, causing database index performance to drop, making read and write operations slower. The author recommends alternative approaches, such as using UUID version 1 or sequential identifiers, which can greatly enhance performance. The article also provides code examples and analyses to help developers better understand the impact these keys can have on their applications. Ultimately, Atkinson encourages careful consideration of different options before deciding to implement UUID v4 as a primary key in software projects.